Phonograph-horn.



G. W. DUNCAN.

PHONOGRAPH HORN APPLICATION FILED MAY 28, 1908.

914,934. v Patented Mar. 9, 1909.

3 Tar. J..-

f; Er. '5

awn nam ng;

wi/twewao g; z I 660/96 DMHOQI? UNI ED srArns PATENT-OFFICE.-

GEORGE W. Du-NoAnoF onioAeo, ILLlNOI s.

' amateurs-ease.

Speoificationhf Letters Patent.

' Patented MarchD, 1509;

- Applicationfiiedfiay 28, 1908. Serial N o.435,4. 1

To all whomit may concern.

Be it known that I, GEORGE :DUNCA'N, a citizen of the United States, residing atChicago, in the county of Cool; and State of Illinois, have invented certain new and useful Improvements in Phonograpl1Horns; and I do declare the following to be a full, clear, and exact description of the invention,=such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to acoustics, and is particularly directed to the improvement in the acoustic products of phonograph or graphophone horns speaking tubes or megaphones.

The object of the invention is to rovide a device of this character which wi be efficient in operation and cheap to manufacture; Which will have its tone" pro erly modulated to eliminate all harsh, squea y andunpleasant noises so that the, pure mellow notesof the voice or instrument are reproduced approximately in the form and tone of their original production.

Heretofore to the best of my knowledge there has been no horn'produced which does not at some time give forth blares which usually spoil the whole rendition.

It is the object of my invention to obviate this difficulty and others inherent in the present type of graphophone horns, and broadly speaking consists in applying to the horn a dampening device and an accentuator or tone reproducer in the form of arm or partition placed in the horn in the form of the human vocal cords.

'1?" With these and other objects in view, the

invention consists of certain novel features of constructlon, comblnatlon and arrange- *ment of parts, as will be more fully described and particularly pointed out in the appended claims.

In 'the'accompam'ng drawings-,Figure 1 is a side elevation, Fig. 2 isalongitudinal sec- ,tion therethrough, Fig. ,3-is a transverse sectionon the line of Fi 1, Fig.4 is a detail perspective view of t 1e vocal piece rev I 1 represents the horn whic moved from the horn, and Fig. 5 is a fragmentary section showing themodification. Referring more especially to the-drawings,

as is usual has a 'r'educed en'd 2, and a flared end 3. .In the proposed improvement I providea covering '4 for the flared end 3,1Which is preferably made of some textile fabric and is held in lace'gluing to the outside of the horn, or y asuitableelampin' frame 5, 'a'sisshown, which supports exhaust tube 6 for the sound to which may be connected the ear tubes for use in connection with slotmaouta portionof its length and left loose for secured at thein'ner and outer ends. The

sound box may also be treate in a like .manner. 1

--In order to accentuate and render clear the sound caused bythe diaphragmof-the repro 'ducer I insert into the small end of the horn, or the connecting tube from the reproducer ent figures a device which comprises a substantially U-shaped member 10, having its extremities flared out at right angles into of the horn or extension and act in connection with the apex of'the member to sup ort the device in the horn or extension.

the member 11 in the same manner as. the human vocal cords are operated and thus than could otherwise be obtained. This effect of the fabric within the horn and extension modifies the tone so that there isno harshness of the resultant roduct; The clarifying device 11 is prefer-ah y lined or covered with a suitable fabric 12, asis, shown.

From the foregoing description, taken in redp'iring a more extended explanation.

- ariouschangesin he form, proportion and the minor, details 'of construction may be resorted to without departing from the chines. As shown in Fig. 2 the inner side of the-remainder ofrits length, it being of courseto the horn as is shown in the several differ either method may be adopted and that the. g fabric may be cemented to the horn through-' lateral flanges '11, which engage the interior produce a clearer and more vibrant sound extension from the born to the re reducer or he, sound waves from the diaphragm act upon device accentuates and clarifies the notes from the sound box, and the dampening .0 connection with the accompanying draw-' ings, the construction and operation of thev invention will be readily understoodwithout principle 01 seci'ificing any of she adve'niagav Of this invention :siefined in the appended claims.

Having thus'described myinvention, What I claim and desae t0 seeure by Letters Pat-' 2. A honogmph horn having a U-shaped longitueinzfily dlSPOSBd aceentueting and elaniymg de'v'lce located therein, and. a 1:) dampemng fabric eevermg smd dev ce.

In testimony whereof 1 have hereunto set;

my hand in presence of two subscribing witnesses.

GEORGE W. DUNCAN.

WULn-esses [EL A, News,

E. MIDILMAN 

